Spray gun for the application of dual component media and use of the spray gun to apply adhesives

Abstract

A spray gun to apply dual component media has a gun housing with an application nozzle, a mixing system for combining the components and a material channel in the gun housing for introducing the first component into the mixing system, a needle shut-off mechanism sliding along its longitudinal axis and guided in the gun housing, at least one reagent channel in the needle shut-off mechanism to introduce the second component into the mixing system and/or into the material channel, at least one outlet opening arranged in the reagent channel away from the longitudinal axis to release the second component from the reagent channel, at least one control device to slide the needle shut-off mechanism inside the gun housing, and at least one metering device to alter the cross-section of the at least one outlet opening.

1 . Spray gun for the application of dual component media,
 with a gun housing ( 1 ),   with an application nozzle ( 2 ) on the gun housing ( 1 ),   with a mixing system ( 3 ) in the gun housing for combining the components,   with a material channel ( 6 ) in the gun housing ( 1 ) for introducing the first component into the mixing system ( 3 ), with a needle shut-off mechanism ( 7 ) sliding along its longitudinal axis and guided in the gun housing ( 1 ),   with at least one reagent channel ( 8 ) in the needle shut-off mechanism ( 7 ) to introduce the second component into the mixing system ( 3 ) and/or into the material channel ( 6 ),   with at least one outlet opening ( 9 ) arranged in the reagent channel ( 8 ) away from the longitudinal axis of the needle shut-off mechanism to release the second component from the reagent channel ( 8 ),   with at least one control device on the spray gun to slide the needle shut-off mechanism ( 7 ) inside the gun housing ( 1 ), with at least one metering device on the spray gun to alter the cross-section of the aperture of the at least one outlet opening ( 9 ) of the needle shut-off mechanism ( 7 ) by guiding the needle shut-off mechanism ( 7 ) along a fixed cover in the housing ( 1 ) when the needle shut-off mechanism ( 7 ) is slid.   
     
     
         2 . Spray gun according to  claim 1 , wherein the mixing system ( 3 ) is a static mixer. 
     
     
         3 . Spray gun according to  claim 1 , wherein the mixing system exhibits the cover. 
     
     
         4 . Spray gun according to  claim 1 , wherein the needle shut-off mechanism exhibits a section with a seat area ( 10 ) for engaging in an area of the application nozzle ( 2 ) that has the shape of a needle seat ( 11 ). 
     
     
         5 . Spray gun according to  claim 4 , wherein the needle shut-off mechanism ( 7 ) exhibits at least one rest position in which the seat area ( 10 ) of the needle shut-off mechanism ( 7 ) engages in the needle seat ( 11 ) of the application nozzle ( 2 ) and the outlet opening ( 9 ) is fully covered by the cover. 
     
     
         6 . Spray gun according to  claim 4 , wherein the needle shut-off mechanism ( 7 ) exhibits at least one cleaning position in which the seat area ( 10 ) of the needle shut-off mechanism ( 7 ) is moved out of the needle seat ( 11 ) and the at least one outlet opening ( 9 ) is fully covered by the cover. 
     
     
         7 . Spray gun according to  claim 4 , wherein the needle shut-off mechanism ( 7 ) exhibits at least one working position in which the seat area ( 10 ) of the needle shut-off mechanism ( 7 ) is moved out of the needle seat ( 11 ) by sliding of the needle shut-off mechanism ( 7 ) and the outlet opening ( 9 ) is fully or partly exposed by the cover. 
     
     
         8 . Spray gun according to  claim 1 , wherein the reagent channel ( 8 ) can be shut off from a supply of the second component by at least one shutoff device. 
     
     
         9 . Spray gun according to  claim 8 , wherein the shutoff device is a check valve. 
     
     
         10 . Use of a spray gun in accordance with  claim 1  for the application of an adhesive obtained as the reaction product of a first and a second component. 
     
     
         11 . Use of a spray gun according to  claim 10 , where the adhesive is a water-based adhesive. 
     
     
         12 . Use of a spray gun according to  claim 11 , where the first component is a polychloroprene dispersion. 
     
     
         13 . Use of a spray gun according to  claim 10 , where the second component is an activator. 
     
     
         14 . Use of a spray gun according to  claim 10 , where the second component is CO 2 . 
     
     
         15 . Use of a spray gun according to  claim 10  for bonding foams in mattress and furniture/upholstery bonding.